Lebesgue controlling convergence theory is used to extend the division of unascertained numbers into the area of 2 unascertained numbers.

Calculation of water environmental capacity in lake and reservoir based on unascertained number theory;

Qualitative estimation method of equipment life cycle cost based on unascertained number theory;

In this paper, the correspondence K from the real number set R to the subset R of the unascertained number set R has been given here.

The unascertained mathematics analysis method of the measurable results about the dissolved oxygen of water;

The unascertained mathematics was introduced to analyze the representative values of compressive strength of concrete core from cast in-suit pile at the condition of small sampling data.

Assessment model of water quality risk based on unascertained mathematics theory;

Since the unascertained characteristic of stream sediments system, unascertained mathematics theories are applied to the assessment of heavy metal pollution in stream sediments.

A problem of allowable load of a predominant pollutant for main stream reservoir is preliminarily approached according to the theory of unascertained mathematics,on the basis of unascertained information of river hydrology and water quality.

On the basis of defining the concepts of unascertained parameters of water environment, an unascertained model for calculation of water environmental carrying capacity was established by treating the parameters in traditional model as unascertained numbers.